title: Phototropin-dependent weak and strong light responses in the determination of branch position in the moss Physcomitrella patens.
abstract: Branch position in the moss Physcomitrella patens is regulated by blue light. In this study, fluence rate dependency of branch position determination was investigated by partial cell irradiation with a microbeam. With a 30 Wm(-2) or lower fluence rate, branches formed at the microbeam area, but formed outside the microbeam when the fluence rate was raised to > or = 200 Wm(-2). Thus, both weak and strong light responses influence the determination of branch position. Further, light sensitivity of both responses was reduced in phototropin knock-out lines, revealing an involvement of phototropin as the blue light receptor.
authors.affiliation: Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo, 192-0397 Japan.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Uenaka
authors.forename: Akeo
authors.initials: A
authors.lastname: Kadota
mesh_terms: D019068:Bryopsida / Q000166:cytology / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects*; D016764:Cell Polarity; D056931:Cryptochromes; D005420:Flavoproteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D008027:Light; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D056931:Cryptochromes; D005420:Flavoproteins; D010940:Plant Proteins